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O-LevelChemistryMetals & Reactivity5070/11 · Oct/Nov 2013 · Q211 Mark

When pure gas X was passed through the apparatus shown, the copper(II) oxide turned pink and the limewater stayed colourless. What is gas X?

Diagram for this question, from the exam paper

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Acarbon dioxide
Bcarbon monoxide
Chydrogen
Dnitrogen

✓ Correct answer

C: hydrogen

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About this question

Topic
Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source
O-Level Chemistry, Oct/Nov 2013 Paper 1 Variant 1, question 21.

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